Composite sewing thread of ceramic fibers

Abstract

A composite fiber sewing thread comprising a central core having one or more strands of an inorganic or organic fiber or blends thereof, and an outer jacket enclosing the core and having the form of a tubular body of braided strands of continuous ceramic fibers is disclosed. The thread is useful in very high temperature applications.

I claim: 
     
       1. A composite sewing thread comprising: a central core having one or more strands of inorganic or organic fibers or blends thereof, and   an outer jacket enclosing said core and having the form of a tubular body of braided strands of continuous ceramic fibers, said braided strands being served with fibers selected from inorganic and organic fibers.   
     
     
       2. The sewing thread according to claim 1 wherein said central core comprises one or more strands of organic fibers. 
     
     
       3. The sewing thread according to claim 2 wherein said organic fibers are selected from the group consisting of rayon, polyester, polyamide, elastomeric, cotton, and aramid fibers. 
     
     
       4. The sewing thread according to claim 2 wherein said organic fibers are aramid fibers. 
     
     
       5. The sewing thread according to claim 2 wherein said organic fibers are heat fugitive. 
     
     
       6. The sewing thread according to claim 1 wherein said central core comprises one or more strands of inorganic fibers. 
     
     
       7. The sewing thread according to claim 6 wherein said inorganic fibers selected from the group consisting of fused silica, alumina-silica, zirconia-silica, alumina-chromia metal (IV) oxide, titania, thoria-silica metal (III) oxide graphite, refractory metal wire, and alumina-boria- silica fibers. 
     
     
       8. The sewing thread according to claim 6 wherein said inorganic fibers are alumina-boria-silica ceramic fibers. 
     
     
       9. The sewing thread according to claim 1 wherein said ceramic fibers are alumina-boria-silica fibers. 
     
     
       10. The sewing thread according to claim 9 or 8 wherein said inorganic fibers are alumina-boria-silica fibers having an alumina:boria mol ratio of 9:2 to 3:1.5, and containing up to 65 weight percent silica. 
     
     
       11. The sewing thread according to claim 1 wherein said strands of said central core each have a number of fibers in the range of 25 to 1000 and a fiber denier in the range of 50 to 1800. 
     
     
       12. The sewing thread according to claim 1 wherein said jacket has 4 to 16 strands. 
     
     
       13. The sewing thread according to claim 1 wherein said jacket has a linear density of 5 to 30 picks. 
     
     
       14. The sewing thread according to claim 1 wherein said ceramic fibers are selected from fused silica, alumina-silica, thoria-silica metal (III) oxide, zirconia-silica, alumina-chromia metal (IV) oxide, titania, and alumina-boria-silica fibers. 
     
     
       15. The sewing thread according to claim 1 wherein said strands in said jacket each have a number of fibers in the range of 130 to 780 and a denier in the range of 200 to 1800 denier. 
     
     
       16. The sewing thread according to claim 1 the strength of which is maintained up to 1150° C. 
     
     
       17. A composite sewing thread comprising: a central core having one strand of continuous or staple aramid fibers, said strand having a fiber denier in the range of 300 to 600, and one strand of continuous alumina-boria-silica fibers, said strand having a number of fibers in the range of 130 to 390 and a fiber denier in the range of 400 to 900, and   an outer jacket enclosing said core and having the form of a tubular body of 8 braided strands of continuous alumina-boria-silica fibers, each braid strand having a number of fibers in the range of 130 to 780 and a fiber denier in the range of 200 to 1800, each braided strand being double served with 50 denier rayon yarn, and said tubular body having a number of picks in the range of 10 to 20 picks per 2.54 cm, said alumina-boria-silica fibers having an alumina:boria mol ratio of 9:2 to 3:1.5, and containing up to 65 weight percent of silica.     
     
     
       18. A high temperature resistant article sewn with the sewing thread according to claim 1. 
     
     
       19. A high temperature resistant fabric article sewn with the sewing thread according to claim 1. 
     
     
       20. A composite sewing thread comprising: a central core having one or more strands of inorganic or organic fibers or blends thereof, and   an outer jacket enclosing said core and having the form of a tubular body of braided strands of continuous ceramic fibers.